Sumitomo SH200-5 Fault Code 0117: Complete Diagnostic Guide

What is Sumitomo SH200-5 Fault Code 0117?

Fault Code 0117 on the Sumitomo SH200-5 excavator indicates a Main Pump Pressure Sensor Circuit malfunction, specifically detecting abnormal voltage or signal output from the hydraulic pump pressure sensor. This diagnostic trouble code (DTC) triggers when the Engine Control Module (ECM) receives voltage readings outside the expected range of 0.5-4.5 volts from the main pump pressure sensor.

This sensor is critical for the SH200-5's hydraulic system performance, as it monitors discharge pressure from the main hydraulic pumps and sends real-time data to the controller. The ECM uses this information to optimize engine speed, adjust pump swash plate angles, and prevent hydraulic system damage. When Code 0117 appears, the excavator typically enters a derate mode to protect components from operating without proper pressure feedback.

Common Symptoms

• Hydraulic power reduction or limited boom/arm/bucket speed even at full throttle
• Yellow warning light illuminated on the instrument cluster, sometimes accompanied by audible alarm
• Erratic engine RPM fluctuations during hydraulic operations or under load
• Loss of automatic engine deceleration when controls are neutralized
• Diagnostic display showing "0117" or "Pump Sensor Error" on compatible scan tools

Potential Causes

The most common technical failures triggering Code 0117 on used SH200-5 excavators include:

• Pressure sensor internal failure (common after 8,000+ operating hours due to constant vibration exposure)
• Corroded or damaged wiring harness connectors at the sensor junction near the main pump assembly—a known wear point on this model
• Chafed sensor wiring where the harness passes under the hydraulic tank mounting brackets (specific rubbing issue on SH200-5)
• ECM voltage supply issues providing incorrect 5-volt reference to the sensor circuit
• Contaminated sensor connector pins from hydraulic oil mist or water intrusion through worn cab floor seals
• Failed ECM internal circuitry (less common but possible in high-hour machines)

How to Troubleshoot and Fix Code 0117

Step 1: Visual Inspection Locate the main pump pressure sensor on the hydraulic pump discharge manifold. Inspect the three-pin connector for corrosion, bent pins, or hydraulic oil contamination. On used excavators, carefully trace the entire harness to the ECM, checking for rubbing at known wear points near tank brackets and frame cross-members.

Step 2: Electrical Testing Using a digital multimeter (DMM), backprobe the sensor connector with the ignition ON, engine OFF. Verify 5-volt reference supply on the signal wire (typically red/white). Check sensor ground continuity (should read less than 1 ohm to chassis ground). Measure sensor output voltage—it should range between 0.8-1.2 volts at rest.

Step 3: Dynamic Testing Start the engine and monitor sensor voltage while operating hydraulics. Voltage should increase proportionally with hydraulic demand (up to 3.5-4.2 volts under load). Erratic readings or frozen values indicate sensor failure.

Step 4: Component Replacement If testing confirms sensor failure, replace with OEM or equivalent pressure transducer (part number reference: 20Y-06-31121 or compatible). For used machines, always replace the connector pigtail simultaneously to prevent future corrosion issues. Clear codes using diagnostic software and perform calibration verification through the service menu.

Disclaimer: This guide provides general troubleshooting information. Always consult the official Sumitomo service manual and consider professional diagnostic assistance for complex electrical issues or if unfamiliar with high-pressure hydraulic systems.